Hi - I had a similar problem with TurboTax Deluxe, but luckily found a comment in an old posting that works for me....
If you have a flash drive installed, just take it out and restart TT.... why, it works I have no idea.
Possibly fails because the system when I installed 2020 originally is not exactly the same as 'now' (I swap flash drives for quick backups every month, so the one I'm using now is not what was on the laptop when TT installed a few weeks ago). That's a guess... but removing the flash drive works - when I forget, it prompts, I remove and restart and tis fine
